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In a method and apparatus for detection of reciprocating machine faults and failures, data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders is acquired. The acquired data is transformed using a computer to produce torque waveforms corresponding to

In a method and apparatus for detection of reciprocating machine faults and failures, data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders is acquired. The acquired data is transformed using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms. An optimization algorithm is used to obtain a number of parameters corresponding to the number of cylinders of the machine for both compression and expansion cycles of the machine in an independent manner and for each cylinder. The optimized parameters and the transformed torque waveforms are then presented to the user to identify each cylinder\s condition.

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A method for detection of reciprocating machine faults and failures, comprising the steps of: a) acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders; b) transforming said acquired data using a computer to produce torque waveforms corres

A method for detection of reciprocating machine faults and failures, comprising the steps of: a) acquiring data representing velocity variation waveforms of a reciprocating machine having a plurality of cylinders; b) transforming said acquired data using a computer to produce torque waveforms corresponding to the acquired velocity variation waveforms; c) using a model-based optimization algorithm to obtain: (i) a coefficient corresponding to the compression cycle for each cylinder, and (ii) a coefficient corresponding to the expansion cycle for each cylinder, wherein the coefficient corresponding to the expansion cycle is derived independently from the coefficient corresponding to the compression cycle; d) presenting the compression coefficient, the expansion coefficient, and the transformed torque waveforms to a user to distinguish between compression faults and expansion faults for each cylinder; and e) determining a reciprocating machine imbalance by detecting at least one of the compression fault and the expansion fault.